WO2019242018A1

WO2019242018A1 - Handwriting sensing apparatus and low power consumption control circuit and method therefor

Info

Publication number: WO2019242018A1
Application number: PCT/CN2018/092480
Authority: WO
Inventors: 曾露
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2018-06-22
Filing date: 2018-06-22
Publication date: 2019-12-26
Also published as: CN112470106A

Abstract

Provided in the present application are a handwriting sensing apparatus and a low power consumption control circuit and method therefor. The low power consumption control circuit comprises a detection circuit, a handover switch, a metal shielding layer and a control unit, wherein the metal shielding layer is selectively connected to one of the detection circuit and a grounding terminal electrically by means of the handover switch; when electrically connected to the metal shielding layer, the detection circuit detects, by means of the metal shielding layer, a first pressure sensing signal sent by a stylus of the handwriting sensing apparatus, and reports the detected first pressure sensing signal to the control unit; the first pressure sensing signal is a pressure sensing signal sent by the stylus when close to but not in contact with a writing face of the handwriting sensing apparatus; and the control unit is used for controlling, when a touch controller is in a dormant state and receives the first pressure sensing signal reported by the detection circuit, the touch controller to restore a working state, and for controlling the handover switch to electrically connect the metal shielding layer to the grounding terminal.

Description

Handwriting induction device and low power consumption control circuit and method thereof

Technical field

The present application relates to the technical field of control circuits, and in particular, to a handwriting sensing device and a low power consumption control circuit and method thereof.

Background technique

In the existing active pen touch system, in order to achieve real-time response of the stroke, the touch controller of the handwriting sensing device needs to be continuously in a working state and continuously scan the touch surface in order to respond to the touch operation of the active pen at any time. However, continuous scanning of the touch surface tends to cause problems such as large overall power consumption and low endurance of the system. Such problems are more obvious in touch systems with multiple touch surfaces.

Summary of the Invention

The application provides a handwriting sensing device and a low power consumption control circuit and method thereof, which can allow the touch controller to enter a sleep state when no handwriting operation has been received for a long time, so as to reduce system power consumption and extend system battery life. The touch controller is awakened in time before the touch operation is about to occur, so as to respond to the touch operation in a timely manner, and effectively avoid the occurrence of strokes.

In a first aspect, the present application provides a low power consumption control circuit, which is applied to a handwriting sensing device. The low-power-consumption control circuit includes a detection circuit, a switch, a metal shield layer, and a control unit, and the metal shield layer is configured to be electrically connected to one of the detection circuit and a ground terminal through the switch. , Wherein the metal shielding layer is electrically connected to the detection circuit when a touch controller of the handwriting sensing device is in a sleep state;

The control unit is electrically connected to the detection circuit, the switch, and the touch controller, respectively, and the detection circuit is configured to detect the handwriting induction through the metal shielding layer when it is electrically connected to the metal shielding layer. A first pressure-sensitive signal sent by the device's stylus and reporting the detected first pressure-sensitive signal to the control unit, wherein the first pressure-sensitive signal is when the stylus approaches A pressure-sensitive signal sent when the writing surface of the handwriting sensing device is contacted;

The control unit is configured to control the touch controller to resume the working state when the touch controller is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit, and control the switch The metal shielding layer is electrically connected to the ground terminal.

In a second aspect, the present application provides a handwriting sensing device including the low-power consumption control circuit described in the first aspect.

In a third aspect, the present application provides a low power consumption control method, which is applied to a handwriting sensing device. The handwriting sensing device includes a low-power consumption control circuit. The low-power consumption control circuit includes a detection circuit, a switch, and a metal shield layer. The metal shield layer is used to selectively communicate with the detection circuit through the switch. And is electrically connected to one of the ground terminals, wherein the metal shielding layer is electrically connected to the detection circuit when the touch controller of the handwriting sensing device is in a sleep state. The low power consumption control method includes:

When the touch controller is in a sleep state, the detection circuit detects a first pressure-sensitive signal sent by a stylus of the handwriting sensing device through the metal shielding layer, wherein the first pressure-sensitive signal is A pressure-sensitive signal emitted when the stylus approaches but does not contact the writing surface of the handwriting sensing device; and

When the detection circuit detects the first pressure-sensitive signal, the touch controller is controlled to resume an operating state, and the switch is controlled to conduct electrical connection between the metal shield layer and the ground terminal.

The low-power-consumption control circuit and method of the present application use a grounded metal shielding layer of a handwriting sensing device as a detection electrode for detecting the proximity of the stylus, and can change the touch controller in time through a simple frequency detection circuit and a switch. Working state of the touch controller, thereby allowing the touch controller to enter a sleep state when no handwriting operation has been received for a long time to reduce system power consumption, extend system battery life, and be able to wake up the touch control in time before a touch operation is about to occur Device in order to respond to touch operations in a timely manner, effectively avoiding the occurrence of strokes.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present application or the prior art more clearly, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative labor.

FIG. 1 is a schematic diagram of a touch system according to an embodiment of the present application.

FIG. 2 is a schematic structural diagram of a low power consumption control circuit according to an embodiment of the present application.

FIG. 3 is a flowchart of a low power consumption control method according to an embodiment of the present application.

detailed description

In the following, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the implementations in this application, all other implementations obtained by a person of ordinary skill in the art without creative labor shall fall within the protection scope of this application.

Please refer to FIG. 1, which is a schematic diagram of a touch system 100 according to an embodiment of the present application. The touch system 100 may include a stylus 20 and a handwriting sensing device 30. The handwriting sensing device 30 may be an electronic handwriting tablet, the stylus pen 20 has a touch pressure sensing function, and may establish a communication connection with the handwriting sensing device 30. Specifically, the stylus pen 20 may include a pen core, a pressure sensor, and a first communication module (not shown). The pressure sensor is configured to sense a pen tip of the pen core when the stylus pen 20 is writing. The touch pressure is received and a pressure-sensitive signal is generated. The stylus pen 20 transmits the pressure-sensitive signal to the handwriting sensing device 30 through the first communication module.

When the stylus pen 20 is writing on the writing surface 301 of the handwriting sensing device 30, the handwriting sensing device 30 senses the writing operation of the stylus pen 20 through the writing surface 301 and generates a corresponding Touch coordinate data, and generate a three-dimensional touch handwriting corresponding to the real handwriting according to the received pressure-sensitive signal and the generated touch coordinate data.

Please refer to FIG. 2, which is a schematic structural diagram of a low-power consumption control circuit 40 according to an embodiment of the present application. The low-power consumption control circuit 40 can be applied to the handwriting sensing device 30 described above. As shown in FIG. 2, the handwriting sensing device 30 may include a touch sensing device 31, a touch controller 32 electrically connected to the touch sensing device 31, and a protective layer 33 covering a touch surface of the touch sensing device 31. For example, the protective layer 33 may be a transparent cover plate or a transparent protective film for protecting the touch sensing device 31.

The touch sensing device 31 may be a touch panel or a touch display screen. When the stylus pen 20 is writing on the writing surface 301 of the touch sensing device 31, the touch sensing device 31 senses the writing operation of the stylus pen 20 through the writing surface 301 and generates a corresponding touch. Control coordinate data.

In one embodiment, the touch sensing device 31 may include a capacitive touch sensor for sensing a touch signal of the stylus 20 and forming a coupling capacitance with the stylus 20, The touch coordinate data is further generated according to the change in the coupling capacitance.

The touch controller 32 is configured to acquire the touch coordinate data. In this embodiment, the handwriting sensing device 30 may further include a second communication module (not shown), and the touch controller 32 may obtain the pressure sensitivity sent by the stylus pen 20 through the second communication module. signal.

In this embodiment, the handwriting sensing device 30 further includes a control unit 35 electrically connected to the touch controller 32. The touch controller 32 is further configured to combine the obtained pressure-sensitive signal with the touch The coordinate data is transmitted to the control unit 35 to trigger the control unit 35 to generate a three-dimensional touch stroke corresponding to the real stroke.

In order to be suitable for different writing desktops, the handwriting sensing device 30 further includes a metal shielding layer 34 disposed on a surface of the touch sensing device 31 away from the protective layer 33. The metal shielding layer 34 may be a conductive metal such as aluminum foil or copper foil. The metal shielding layer 34 is electrically connected to the ground terminal 50 to form a shielding layer for shielding interference signals from a desktop or the like to avoid or reduce the interference. These interference signals cause interference to signals sensed by the touch sensing device 31 and signals received by the touch controller 32.

In this embodiment, the low power consumption control circuit 40 includes a detection circuit 41, a switch 42, the metal shielding layer 34, and the control unit 35. The detection circuit 41 and the switch 42 are disposed on the handwriting sensing device 30.

In this embodiment, the metal shielding layer 34 is used to selectively electrically connect to one of the detection circuit 41 and the ground terminal 50 through the changeover switch 42, that is, the changeover switch 42 is used for For selectively conducting the electrical connection between the metal shielding layer 34 and the detection circuit 41, or selectively conducting the electrical connection between the metal shielding layer 34 and the ground terminal 50.

The metal shielding layer 34 is electrically connected to the ground terminal 50 when the touch controller 32 is in the working state, that is, the metal shielding layer 34 is in a shielding mode, so that the handwriting sensing device 30 can be normally implemented. Touch-sensitive function. The metal shielding layer 34 is electrically connected to the detection circuit 41 when the touch controller 32 is in a sleep state.

The control unit 35 is electrically connected to the detection circuit 41, the switch 42, and the touch controller 32, respectively. The control unit 35 is configured to receive touch coordinate data uploaded by the touch controller 32 and a pressure-sensitive signal of a stylus pen when the touch controller 32 is in a working state, and according to the received touch coordinate data and The pressure-sensitive signal of the stylus generates a three-dimensional touch stroke corresponding to the real stroke to trigger a corresponding touch function or convert it into a corresponding input text, thereby realizing a touch recognition function.

The control unit 35 is further configured to control the touch controller 32 to enter a sleep state when the touch coordinate data uploaded by the touch controller 32 is not received within a preset time, and control the switch 42 to be turned on. The metal shielding layer 34 is electrically connected to the detection circuit 41.

Specifically, the control unit 35 is configured to generate a sleep control signal and a first on signal when the touch coordinate data uploaded by the touch controller 32 in the working state is not received within a preset time, and set the A sleep control signal is sent to the touch controller 32 to control the touch controller 32 to enter a sleep state, and to control the switch 42 to turn on the metal shielding layer 34 and the The electrical connection of the detection circuit 41.

It can be understood that when the user has not used the stylus pen 20 for a long time, which causes the touch sensing device 31 not to sense the touch signal of the stylus pen 20 within a preset time, the touch sensing The device 31 does not generate touch coordinate data within a preset time. Therefore, the control unit 35 will not receive touch coordinate data uploaded by the touch controller 32 in a working state within a preset time. At this time, the control unit 35 controls the touch controller 32 to enter a sleep state, which can reduce system power consumption and extend system battery life.

In this embodiment, the metal shielding layer 34 forms a detection electrode when it is electrically connected to the detection circuit 41, and the detection circuit 41 is configured to pass the metal shield when it is electrically connected to the metal shielding layer 34. The layer 34 detects a first pressure-sensitive signal sent from the stylus 20 of the touch system 100 and reports the detected first pressure-sensitive signal to the control unit 35. The first pressure-sensitive signal is a pressure-sensitive signal sent when the stylus pen 20 approaches but does not contact the writing surface 301 of the handwriting sensing device 30.

The stylus pen 20 with pressure sensitivity usually outputs pressure-sensitive signals with different frequencies corresponding to different touch pressures. When there is no touch pressure, that is, the stylus pen 20 is not in contact with the writing surface 301 of the handwriting sensing device 30, the stylus pen 20 will output a 0th order pressure-sensitive signal, that is, in this embodiment The first pressure-sensitive signal is a zero-order pressure-sensitive signal.

Since the metal shielding layer 34 covers the entire touch area of the touch sensing device 31, the metal shielding layer 34 can be used as a large-area detection electrode to receive the 0th order pressure-sensitive signal, so as long as the stylus 20 Close to the touch area, the detection circuit 41 can detect the 0th order pressure-sensitive signal through the metal shielding layer 34 and report the detected 0th order pressure-sensitive signal to the control unit 35. .

The detection circuit 41 can detect a preset frequency or continuously detect the 0th order pressure-sensitive signal.

In this embodiment, in order to better detect the 0th-order pressure-sensitive signal, the detection circuit 41 detects the 0th-order pressure-sensitive signal at the same detection frequency as the frequency of the 0th-order pressure-sensitive signal.

It can be understood that, by setting the detection frequency of the detection circuit 41 to be the same as the frequency of the 0th-order pressure-sensitive signal, when the stylus 20 approaches the writing surface 301 of the handwriting sensing device 30 , It is possible to detect whether there is a 0th-order pressure-sensitive signal by using the same-frequency interference noise generated when the 0th-order pressure-sensitive signal sent by the stylus pen 20 approaches the metal shielding layer 34.

In this embodiment, the detection circuit 41 may be further configured to perform amplification, frequency division, and other processing on the detected 0th-order pressure-sensitive signal, and then report it to the control unit 35.

The control unit 35 may be, for example, a microcontroller or a microprocessor. The control unit 35 is further configured to control the touch controller 32 to resume the working state when the touch controller 32 is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit 41 to wake up The touch sensing function of the handwriting sensing device 30 controls the switch 42 to conduct electrical connection between the metal shielding layer 34 and the ground terminal 50.

Specifically, the control unit 35 is configured to generate a wake-up control signal and a second on signal when the touch controller 32 is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit 41, and Sending the wake-up control signal to the touch controller 32 to control the touch controller 32 to resume working state, and controlling the switch 42 to turn on the metal shielding layer 34 according to the second conduction signal And electrical connection with the ground terminal 50.

It can be understood that after the touch controller 32 resumes the working state, the metal shielding layer 34 is restored to the shielding mode due to the electrical connection with the ground terminal 50, and the detection circuit 41 cannot pass through the metal. The shielding layer 34 detects the 0th order pressure-sensitive signal. After the touch controller 32 resumes the working state, it can receive the pressure-sensitive signal, such as a pressure-sensitive signal of the order of 0 to 2048, sent by the stylus 20.

It can be seen that, using the low power consumption control circuit 40 provided in the embodiment of the present application, when the touch controller 32 is in a sleep state, when the stylus 20 is close to but not in contact with the handwriting sensing device 30 When writing surface 301, the detection circuit 41 and the metal shielding layer 34 used as the detection electrode can detect the 0th order pressure-sensitive signal from the stylus 20 in advance, so that the stylus 20 can be detected on the stylus 20. Before touching the writing surface 301 of the handwriting sensing device 30, wake up the touch sensing function of the handwriting sensing device 30 in time, so as to respond to the touch operation of the stylus pen 20 in time and effectively avoid the occurrence of strokes. .

In one embodiment, the switch 42 includes a first connection terminal 421, a second connection terminal 422, and a third connection terminal 423. The first connection terminal 421 is electrically connected to the metal shielding layer 34. The second connection terminal 422 is electrically connected to the detection circuit 41, and the third connection terminal 423 is electrically connected to the ground terminal 50. The control unit 35 may control the first connection terminal 421 of the switch 42 to be electrically connected to the second connection terminal 422 or the third connection terminal 423, and at the same time, the first connection terminal of the switch 42 421 can only choose to connect one of the second connection terminal 422 and the third connection terminal 423, so that the electrical connection between the metal shielding layer 34 and the detection circuit 41 can be conducted through the switch 42, or an electrical connection can be conducted. The metal shielding layer 34 is electrically connected to the ground terminal 50.

The switch 42 further includes a control terminal 424, and the control unit 35 is electrically connected to the control terminal 424, and the first connection terminal 421 and the second connection terminal 422 of the switch 42 are connected through the control terminal 424. And the electrical connection state between the third connection terminal 423 and the control.

In some embodiments, the switch 42 may be a single-pole double-throw electronic switch. The switch 42 may further include a conductive arm 425. One end of the conductive arm 425 is electrically connected to the first connection end 421, and the other end is connected to the second connection end 422 through the control unit 35. One of the three connection terminals 423 is electrically connected.

Optionally, in another embodiment, the switch 42 may also include a first switch tube and a second switch tube, and the first switch tube is electrically connected to the metal shielding layer 34 and the detection circuit. Between 41, the second switching tube is electrically connected between the metal shielding layer 34 and the ground terminal 50, and the conducting states of the first switching tube and the second switching tube at the same time are opposite, that is, When one of the switches is turned on, the other switch is turned off.

The low power consumption control circuit 40 of the present application multiplexes the ground metal shielding layer 34 of the handwriting sensing device 30 as a detection electrode for detecting whether the stylus 20 is approaching, and by adding a simple frequency detection circuit 41 and a switch 42, the working state of the touch controller 32 can be changed in time, thereby allowing the touch controller 32 to enter the sleep state when no handwriting operation has been received for a long time, in order to reduce system power consumption, extend system battery life, and enable touch operation The touch controller 32 is awakened in time before it occurs, so as to respond to the touch operation in a timely manner and effectively avoid the occurrence of strokes.

Please refer to FIG. 3, which is a flowchart of a low power consumption control method according to an embodiment of the present application. The method can be applied to the handwriting sensing device 30 according to the embodiment shown in FIG. 1-2. As shown in FIG. 3, the low power consumption control method includes the following steps:

Step 310: Receive touch coordinate data uploaded by the touch controller 32 when the touch controller 32 is in a working state.

Step 320: when the touch coordinate data uploaded by the touch controller 32 in the working state is not received within a preset time, control the touch controller 32 to enter a sleep state, and control the switch 42 to be turned on The metal shielding layer 34 is electrically connected to the detection circuit 41.

Specifically, the step 320 may include:

Generating the sleep control signal and the first on signal when the touch coordinate data uploaded by the touch controller 32 in the working state is not received within a preset time; and

Sending the sleep control signal to the touch controller 32 to control the touch controller 32 to enter a sleep state, and controlling the switch 42 to turn on the metal shielding layer 34 according to the first on signal It is electrically connected to the detection circuit 41.

In step 330, the detection circuit 41 detects the first pressure-sensitive signal sent by the stylus 20 of the touch system 100 through the metal shielding layer 34.

The first pressure-sensitive signal is a pressure-sensitive signal sent when the stylus pen 20 approaches but does not contact the writing surface 301 of the handwriting sensing device 30.

Since the stylus 20 with pressure sensitivity usually outputs pressure-sensing signals of different frequencies corresponding to different touch pressures, when there is no touch pressure, the stylus 20 does not contact the handwriting sensing device 30 When the writing surface 301 is 301, the stylus pen 20 outputs a 0-order pressure-sensitive signal, that is, in this embodiment, the first pressure-sensitive signal is a 0-order pressure-sensitive signal.

Optionally, in some embodiments, the step 330 may include: the detection circuit 41 detects the first pressure-sensitive signal at a detection frequency that is the same as the frequency of the first pressure-sensitive signal.

Step 340: When the detection circuit 41 detects the first pressure-sensitive signal, control the touch controller 32 to resume working state, and control the switch 42 to turn on the metal shielding layer 34 and the ground. Electrical connection of terminal 50. The flow returns to step 310, and steps 310-340 are executed cyclically.

Specifically, the step 340 may include:

Generating the wake-up control signal and the second on-signal when the first pressure-sensitive signal is detected; and

Sending the wake-up control signal to the touch controller 32 to control the touch controller 32 to resume working state, and controlling the switch 42 to turn on the metal shielding layer 34 according to the second conduction signal And electrical connection with the ground terminal 50.

The low power consumption control method of the present application can reuse the ground metal shielding layer of the handwriting sensing device as a detection electrode to detect whether the stylus is approaching, and can change the touch control in time through a simple frequency detection circuit and a switch. Working state of the device, thereby allowing the touch controller to enter a sleep state when no handwriting operation has been received for a long time to reduce system power consumption, extend system battery life, and be able to wake up the touch in time before a touch operation is about to occur The controller, in order to respond to the touch operation in a timely manner, and effectively avoid the occurrence of strokes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technology of the present application can be Modifications or equivalent replacements of the schemes should not depart from the spirit and scope of the technical schemes of this application.

Claims

A low-power consumption control circuit applied to a handwriting sensing device is characterized in that the low-power consumption control circuit includes a detection circuit, a switch, a metal shielding layer, and a control unit, and the metal shielding layer is configured to pass through the A switch is selectively electrically connected to one of the detection circuit and a ground terminal, wherein the metal shielding layer is electrically connected to the detection circuit when the touch controller of the handwriting sensing device is in a sleep state;

The control unit is electrically connected to the detection circuit, the switch, and the touch controller, respectively, and the detection circuit is configured to detect the handwriting induction through the metal shielding layer when it is electrically connected to the metal shielding layer. A first pressure-sensitive signal sent by the device's stylus and reporting the detected first pressure-sensitive signal to the control unit, wherein the first pressure-sensitive signal is when the stylus approaches A pressure-sensitive signal sent when the writing surface of the handwriting sensing device is contacted;

The control unit is configured to control the touch controller to resume the working state when the touch controller is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit, and control the switch The metal shielding layer is electrically connected to the ground terminal.
The low power consumption control circuit according to claim 1, wherein the control unit is further configured to receive touch coordinate data uploaded by the touch controller when the touch controller is in a working state; and When the touch coordinate data uploaded by the touch controller in the working state is not received within a set time, the touch controller is controlled to enter a sleep state, and the switch is controlled to turn on the metal shielding layer and the detection. Electrical connection of the circuit.
The low power consumption control circuit according to claim 2, wherein the control unit is configured to generate the sleep control when the touch coordinate data uploaded by the touch controller in the working state is not received within a preset time. Signal, and sending the sleep control signal to the touch controller to control the touch controller to enter a sleep state.
The low power consumption control circuit according to claim 2, wherein the control unit is configured to generate a first touch coordinate data uploaded by the touch controller in a working state within a preset time. A conducting signal, and controlling the switch to conduct electrical connection between the metal shielding layer and the detection circuit according to the first conducting signal.
The low power consumption control circuit according to claim 1, wherein the control unit is configured to generate when the touch controller is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit. A wake-up control signal, and sending the wake-up control signal to the touch controller to control the touch controller to resume a working state.
The low power consumption control circuit according to claim 1, wherein the control unit is configured to generate when the touch controller is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit. A second conduction signal, and controlling the switch to conduct electrical connection between the metal shield layer and the ground terminal according to the second conduction signal.
The low power consumption control circuit according to claim 1, 5 or 6, wherein the first pressure-sensitive signal is a zero-order pressure-sensitive signal.
The low power consumption control circuit according to claim 7, wherein the detection circuit is configured to detect the first pressure-sensitive signal at a detection frequency that is the same as the frequency of the first pressure-sensitive signal.
The low power consumption control circuit according to claim 1, wherein the switch comprises a first connection terminal, a second connection terminal, a third connection terminal, and a control terminal, and the first connection terminal and the metal The shield layer is electrically connected, the second connection terminal is electrically connected to the detection circuit, the third connection terminal is electrically connected to the ground terminal, the control unit is electrically connected to the control terminal, and through the control The terminal controls the electrical connection state between the first connection terminal, the second connection terminal, and the third connection terminal of the switch.
The low power consumption control circuit according to claim 9, wherein the switch further comprises a conductive arm, one end of the conductive arm is electrically connected to the first connection end, and the other end is connected to the control unit. It is electrically connected with one of the second connection terminal and the third connection terminal under control.
A handwriting sensing device includes the low power consumption control circuit according to any one of claims 1-10.
A low power consumption control method is applied to a handwriting induction device, characterized in that the handwriting induction device includes a low power consumption control circuit, and the low power consumption control circuit includes a detection circuit, a switch, and a metal shielding layer. The metal shielding layer is configured to be selectively electrically connected to one of the detection circuit and a ground terminal through the switch, wherein the metal shielding layer is in a sleep state when a touch controller of the handwriting sensing device is in a sleep state. Electrically connected to the detection circuit; the low power consumption control method includes:

When the touch controller is in a sleep state, the detection circuit detects a first pressure-sensitive signal sent by a stylus of the handwriting sensing device through the metal shielding layer, wherein the first pressure-sensitive signal is A pressure-sensitive signal emitted when the stylus approaches but does not contact the writing surface of the handwriting sensing device; and

When the detection circuit detects the first pressure-sensitive signal, the touch controller is controlled to resume an operating state, and the switch is controlled to conduct electrical connection between the metal shield layer and the ground terminal.
The low power consumption control method according to claim 12, wherein the low power consumption control method further comprises:

Receiving touch coordinate data uploaded by the touch controller when the touch controller is in a working state; and

When the touch coordinate data uploaded by the touch controller in the working state is not received within a preset time, the touch controller is controlled to enter a sleep state, and the switch is controlled to turn on the metal shielding layer and Electrical connection of the detection circuit.
The low-power control method according to claim 13, wherein the low-power control method comprises:

Generating a sleep control signal when the touch coordinate data uploaded by the touch controller in a working state is not received within a preset time, and sending the sleep control signal to the touch controller to control the Touch the controller to sleep.
The low-power control method according to claim 13, wherein the low-power control method comprises:

When the touch coordinate data uploaded by the touch controller in a working state is not received within a preset time, a first conduction signal is generated, and the switching switch is turned on according to the first conduction signal. The metal shielding layer is electrically connected to the detection circuit.
The low-power control method according to claim 12, wherein the low-power control method comprises:

When the first pressure-sensitive signal is detected, a wake-up control signal is generated, and the wake-up control signal is sent to the touch controller to control the touch controller to resume a working state.
The low-power control method according to claim 12, wherein the low-power control method comprises:

When the first pressure-sensing signal is detected, a second conduction signal is generated, and the switch is controlled to conduct electrical connection between the metal shield layer and the ground terminal according to the second conduction signal.
The low power consumption control method according to claim 12, 16 or 17, wherein the first pressure-sensitive signal is a zero-order pressure-sensitive signal.
The low-power control method according to claim 18, wherein the low-power control method comprises:

The detection circuit detects the first pressure-sensitive signal at a detection frequency that is the same as the frequency of the first pressure-sensitive signal.